USACE / NAVFAC / AFCEC / NASA UFGS-23 81 00 May 2018) ---------------------------------- Preparing Activity: USACE Superseding UFGS-23 82 02.00 10 (April 2008) UNIFIED FACILITIES GUIDE SPECIFICATIONS References are in agreement with UMRL dated April 2018 SECTION TABLE OF CONTENTS DIVISION 23 - HEATING, VENTILATING, AND AIR CONDITIONING (HVAC) SECTION 23 81 00 DECENTRALIZED UNITARY HVAC EQUIPMENT 05/18 PART 1 GENERAL 1.1 RELATED REQUIREMENTS 1.2 REFERENCES 1.3 SUBMITTALS 1.4 QUALITY ASSURANCE 1.5 DELIVERY, STORAGE, AND HANDLING 1.6 ENVIRONMENTAL REQUIREMENTS 1.7 WARRANTY PART 2 PRODUCTS 2.1 ENERGY EFFICIENCY REQUIREMENTS 2.1.1 Room Air Conditioners 2.1.2 Air-Source Heat Pumps 2.2 MATERIALS 2.2.1 Standard Products 2.2.2 Product Sustainability Criteria 2.2.2.1 Energy Efficient Equipment 2.2.2.2 Electrical Equipment / Motors 2.2.2.3 Ozone Depleting Substances 2.2.2.4 Local/Regional Materials 2.2.2.5 Environmental Data 2.2.3 Nameplates 2.2.4 Safety Devices 2.3 EQUIPMENT 2.3.1 Packaged Terminal [Air Conditioners] [Heat Pumps] 2.3.1.1 Packaged Terminal Unit 2.3.1.2 Compressor 2.3.1.3 Air to Refrigerant Coils 2.3.1.4 Fans 2.3.1.5 Air Filters 2.3.1.6 Primary/Supplemental Heat 2.3.1.6.1 Electric Heating 2.3.1.6.2 Gas-Fired Heating Section 2.3.1.6.3 Hot Water Coils SECTION 23 81 00 Page 1
2.3.1.6.4 Steam Coils 2.3.1.7 Cabinet Construction 2.3.1.8 Louver 2.3.1.9 Ventilation Damper Assembly 2.3.1.10 Wall Sleeve 2.3.1.11 Duct Package 2.3.1.12 Unit Controls 2.3.2 Room [Air Conditioner] [Heat Pump] 2.3.2.1 Primary/Supplemental Heat 2.3.2.1.1 Electric Heating 2.3.2.1.2 Gas-Fired Heating Section 2.3.2.1.3 Hot Water Coils 2.3.2.1.4 Steam Coils 2.3.2.2 Filters 2.3.2.3 Fans 2.3.2.4 Casing 2.3.2.5 Energy Efficiency 2.3.2.6 Units for Operation on 115 Volts 2.3.2.7 Units for Operation on 208 or 230 Volts 2.3.2.8 Controls 2.3.3 Self-Contained Air Conditioners [Heat Pumps] 2.3.3.1 Small-Capacity Self-Contained air conditioners [Heat Pumps] (Not exceeding 19 kw 65,000 Btu/h) 2.3.3.1.1 General 2.3.3.1.2 Air-to-Refrigerant Coils 2.3.3.1.3 Fan Section 2.3.3.1.4 Compressor 2.3.3.1.5 Refrigeration Circuit 2.3.3.1.6 Unit Controls 2.3.3.1.7 Roof Curb 2.3.3.1.8 Primary/Supplemental Heat 2.3.3.1.8.1 Electric Heating 2.3.3.1.8.2 Gas-Fired Heating Section 2.3.3.1.8.3 Hot Water Coils 2.3.3.1.8.4 Steam Coils 2.3.3.1.9 Single Source Power Entry 2.3.3.1.10 Fully Modulating Economizer 2.3.3.1.11 Manual Outside Air Damper 2.3.3.1.12 Low Ambient Control 2.3.3.1.13 Filters 2.3.3.2 Large-Capacity Self-Contained air conditioners [Heat Pumps] (Greater than 19 kw 65,000 Btu/h) 2.3.3.2.1 General 2.3.3.2.2 Casing 2.3.3.2.3 Air-to-Refrigerant Coils 2.3.3.2.4 Compressor 2.3.3.2.5 Refrigeration Circuit 2.3.3.2.6 Unit Controls 2.3.3.2.7 Supply Air Fan 2.3.3.2.8 Roof Curb 2.3.3.2.9 Primary/Supplemental Heat 2.3.3.2.9.1 Electric Heating 2.3.3.2.9.2 Gas-Fired Heating Section 2.3.3.2.9.3 Hot Water Coils 2.3.3.2.9.4 Steam Coils 2.3.3.2.10 Single Source Power Entry 2.3.3.2.11 Fully Modulating Economizer 2.3.3.2.12 Manual Outside Air Damper 2.3.3.2.13 Low Ambient Control SECTION 23 81 00 Page 2
2.3.3.2.14 Filters 2.3.4 Computer Room Air Conditioner 2.3.4.1 General 2.3.4.2 Air-to-Refrigerant Coils 2.3.4.3 Water-to-Refrigerant Coils 2.3.4.4 Compressor 2.3.4.5 Refrigeration Circuit 2.3.4.6 Unit Controls 2.3.4.6.1 Externally Accessible Controls 2.3.4.6.2 Status Indicators 2.3.4.6.3 Alarmed Conditions 2.3.4.6.4 Space Temperature 2.3.4.6.5 Safety Controls 2.3.4.7 Cabinet Construction 2.3.4.8 Filters 2.3.4.9 Remote Condenser or Condensing Unit 2.3.4.9.1 Sound Rating 2.3.4.9.2 Air-Cooled Condenser 2.3.4.9.3 Enclosure 2.3.4.10 Computer Room Humidifier 2.3.4.10.1 Steam Spray Type Humidifier 2.3.4.10.2 Steam-Diffuser Type Humidifier 2.3.4.10.3 Electrode Canister Type Humidifier 2.3.4.10.4 Ultrasonic Type Humidifier 2.3.4.11 Fans 2.3.5 [Mini-]Split-System Air Conditioners [Heat Pumps] 2.3.5.1 Small-Capacity Split-System Air-Conditioners (Not Exceeding 19 kw 65,000 Btu/hr 2.3.5.1.1 Energy Efficiency 2.3.5.1.2 Air-to-Refrigerant Coil 2.3.5.1.3 Compressor 2.3.5.1.4 Refrigeration Circuit 2.3.5.1.5 Unit Controls 2.3.5.1.6 Condensing Coil 2.3.5.1.7 Remote Condenser or Condensing Unit 2.3.5.1.7.1 Sound Rating 2.3.5.1.7.2 Air-Cooled Condenser 2.3.5.1.8 Primary/Supplemental Heat 2.3.5.1.8.1 Electric Heating 2.3.5.1.8.2 Gas-Fired Heating Section 2.3.5.1.8.3 Hot Water Coils 2.3.5.1.8.4 Steam Coils 2.3.5.1.9 Air Filters 2.3.5.1.10 Fans 2.3.5.2 Large-Capacity Split-System Air Conditioners (Greater Than 19 kw 65,000 Btu/h 2.3.5.2.1 Air-To-Refrigerant Coil 2.3.5.2.2 Compressor 2.3.5.2.3 Refrigeration Circuit 2.3.5.2.4 Primary/Supplemental Heat 2.3.5.2.4.1 Electric Heating 2.3.5.2.4.2 Gas-Fired Heating Section 2.3.5.2.4.3 Hot Water Coils 2.3.5.2.4.4 Steam Coils 2.3.5.2.5 Unit Controls 2.3.5.2.6 Remote Condenser or Condensing Unit 2.3.5.2.6.1 Air-Cooled Condenser 2.3.5.2.6.2 Evaporative Condenser 2.3.5.2.6.3 Compressor SECTION 23 81 00 Page 3
2.3.5.2.6.4 Fans 2.3.5.2.7 Filters 2.3.6 Air-Source Unitary Heat Pumps 2.3.6.1 Energy Efficiency 2.3.6.2 Casing 2.3.6.3 Filters 2.3.6.4 Compressors 2.3.6.5 Refrigerant Circuit 2.3.6.6 Evaporator and Condenser Coils 2.3.6.7 Outdoor Fans 2.3.6.8 Indoor Fan 2.3.6.9 Defrost Controls 2.3.6.10 Unit Electrical 2.3.6.11 Operating Controls 2.3.6.11.1 Unit DDC Controller 2.3.6.11.2 Control System Interface 2.3.6.12 Corrosion Protection 2.3.6.12.1 Remote Outdoor Condenser Coils 2.3.6.12.2 Exposed Outdoor Cabinet 2.3.7 Variable Refrigerant Flow (VRF) HVAC Systems 2.3.7.1 Air-Source Outdoor Compressor Unit 2.3.7.2 Casing 2.3.7.3 Fan Coil Refrigerant Evaporator Unit 2.3.7.3.1 Unit Cabinet 2.3.7.3.2 Fans 2.3.7.3.3 Coil 2.3.7.3.4 Motors 2.3.7.4 Refrigeration Circuit 2.3.7.5 Refrigerant Leak Detector 2.3.7.6 Unit Controls 2.4 COMPONENTS 2.4.1 Refrigerant and Oil 2.4.2 Fans 2.4.3 Primary/Supplemental Heating 2.4.3.1 Water Coil 2.4.3.2 Steam Coil 2.4.3.3 Electric Heating Coil 2.4.3.4 Gas-Fired Heating Section 2.4.4 Air Filters 2.4.4.1 Extended Surface Pleated Panel Filters 2.4.4.2 Replaceable Media Filters 2.4.4.3 Sectional Cleanable Filters 2.4.4.4 High Efficiency Filters 2.4.4.5 Manometers 2.4.5 Coil Frost Protection 2.4.6 Pressure Vessels 2.4.6.1 Hot Gas Muffler 2.4.6.2 Liquid Receiver 2.4.6.3 Oil Separator 2.4.6.4 Oil Reservoir 2.4.7 Internal Dampers 2.4.8 Mixing Boxes 2.4.9 Cabinet Construction 2.4.9.1 Indoor Cabinet 2.4.9.2 Outdoor Cabinet 2.4.10 Condenser Water Piping And Accessories 2.4.11 Refrigerant Piping 2.4.12 Cooling Tower 2.4.13 Condensate Drain Piping SECTION 23 81 00 Page 4
2.4.14 Ductwork 2.4.15 Temperature Controls 2.5 UNITARY EQUIPMENT ACCESSORIES AND MISCELLANEOUS EQUIPMENT 2.5.1 Air Economizer 2.5.2 Humidifier 2.5.2.1 Steam Spray Type Humidifier 2.5.2.2 Steam-Diffuser Type Humidifier 2.5.2.3 Electrode Canister Type Humidifier 2.5.2.4 Ultrasonic Type Humidifier 2.5.2.5 Gas-Fired Steam Humidifiers (Stand-Alone) 2.5.2.6 Electrically Heated Steam Humidifiers (Stand-Alone) 2.5.2.7 Refrigerant Leak Detector 2.5.2.8 Refrigerant Relief Valve/Rupture Disc Assembly 2.5.2.9 Refrigerant Signs 2.5.2.9.1 Installation Identification 2.5.2.9.2 Controls and Piping Identification 2.5.2.10 Heat Recovery Devices 2.5.2.10.1 Hot Air Reclaim 2.5.2.10.2 Hot Water Reclaim 2.5.2.11 Gaskets 2.5.2.12 Bolts and Nuts 2.5.2.13 Bird Screen 2.6 FINISHES 2.6.1 Coil Corrosion Protection 2.6.2 Equipment and Components Factory Coating 2.6.2.1 Phenolic Coating 2.6.2.2 Chemical Conversion Coating with Polyelastomer Finish Coat 2.6.2.3 Vinyl Coating 2.6.3 Factory Applied Insulation 2.7 TESTS, INSPECTIONS, AND VERIFICATIONS PART 3 EXECUTION 3.1 EXAMINATION 3.2 INSTALLATION 3.2.1 Equipment 3.2.2 Mechanical Room Ventilation 3.2.3 Field Applied Insulation 3.2.4 Field Painting 3.3 CLEANING AND ADJUSTING 3.4 TRAINING 3.5 REFRIGERANT TESTS, CHARGING, AND START-UP 3.5.1 Refrigerant Leakage 3.5.2 Contractor's Responsibility 3.6 SYSTEM PERFORMANCE TESTS 3.7 MAINTENANCE 3.7.1 EXTRA MATERIALS 3.7.2 Maintenance Service -- End of Section Table of Contents -- SECTION 23 81 00 Page 5
USACE / NAVFAC / AFCEC / NASA UFGS-23 81 00 May 2018) ---------------------------------- Preparing Activity: USACE Superseding UFGS-23 82 02.00 10 (April 2008) UNIFIED FACILITIES GUIDE SPECIFICATIONS References are in agreement with UMRL dated April 2018 SECTION 23 81 00 DECENTRALIZED UNITARY HVAC EQUIPMENT 05/18 NOTE: This guide specification covers the requirements for unitary (packaged and split systems) air conditioners, heat pumps, and accessories. Adhere to UFC 1-300-02 Unified Facilities Guide Specifications (UFGS) Format Standard when editing this guide specification or preparing new project specification sections. Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information. Remove information and requirements not required in respective project, whether or not brackets are present. Comments, suggestions and recommended changes for this guide specification are welcome and should be submitted as a Criteria Change Request (CCR). NOTE: This specification uses tailoring options to select the required protocol for control system interfaces for equipment. These tailoring options are: 1. BACnet Only 2. LonWorks Only 3. BACnet or LonWorks (this will require the unit match the building control system) DESELECT all three if not requiring control system interfaces. Otherwise SELECT exactly ONE of these tailoring options. You have currently SELECTED the following options: SECTION 23 81 00 Page 6
---------------- BACnet Only LonWorks Only BACnet or LonWorks ---------------- If more than one item appears between the dashes above you have included more than one services tailoring option and need to DESELECT tailoring options. PART 1 GENERAL 1.1 RELATED REQUIREMENTS Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS, applies to this section with the additions and modifications specified herein. 1.2 REFERENCES NOTE: This paragraph is used to list the publications cited in the text of the guide specification. The publications are referred to in the text by basic designation only and listed in this paragraph by organization, designation, date, and title. Use the Reference Wizard's Check Reference feature when you add a Reference Identifier (RID) outside of the Section's Reference Article to automatically place the reference in the Reference Article. Also use the Reference Wizard's Check Reference feature to update the issue dates. References not used in the text will automatically be deleted from this section of the project specification when you choose to reconcile references in the publish print process. The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only. AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL (AMCA) AMCA 500-D AMCA 500-L (2012) Laboratory Methods of Testing Dampers for Rating (2015) Laboratory Methods of Testing Louvers for Rating AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI) AHRI 1230 (2010; Addendum 1 2011; Addendum 2 2014) Performance Rating of Variable Refrigerant Flow (VRF) Multi-Split Air-Conditioning and Heat Pump Equipment SECTION 23 81 00 Page 7
AHRI 340/360 I-P AHRI 350 AHRI 390 (2015) Performance Rating of Commercial and Industrial Unitary Air-Conditioning and Heat Pump Equipment (2015) Sound Rating of Non-Ducted Indoor Air-Conditioning Equipment (2003) Performance Rating of Single Package Vertical Air-Conditioners and Heat Pumps AHRI 410 (2001; Addendum 1 2002; Addendum 2 2005; Addendum 3 2011) Forced-Circulation Air-Cooling and Air-Heating Coils AHRI 490 I-P AHRI 540 AHRI 700 AHRI DCAACP ANSI/AHRI 210/240 ANSI/AHRI 270 (2011) Performance Rating of Remote Mechanical-Draft Evaporatively-Cooled Refrigerant Condensers (2015) Performance Rating Of Positive Displacement Refrigerant Compressors And Compressor Units (2016) Specifications for Fluorocarbon Refrigerants (Online) Directory of Certified Applied Air-Conditioning Products (2008; Add 1 2011; Add 2 2012) Performance Rating of Unitary Air-Conditioning & Air-Source Heat Pump Equipment (2008) Sound Rating of Outdoor Unitary Equipment ANSI/AHRI 340/360 (2007; Addendum 1 2010; Addendum 2 2011) Performance Rating of Commercial and Industrial Unitary Air-Conditioning and Heat Pump Equipment ANSI/AHRI 370 ANSI/AHRI 460 ANSI/AHRI 495 ANSI/AHRI 640 ANSI/AHRI/CSA 310/380 (2015; Addendum 1 2016) Sound Rating of Large Outdoor Refrigerating and Air-Conditioning Equipment (2005) Performance Rating of Remote Mechanical-Draft Air-Cooled Refrigerant Condensers (2005) Performance Rating of Refrigerant Liquid Receivers (2005) Performance Rating of Commercial and Industrial Humidifiers (2014) Standard for Packaged Terminal Air-Conditioners and Heat Pumps SECTION 23 81 00 Page 8
AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE) ANSI/ASHRAE 15 & 34 ASHRAE 127 ASHRAE 15 & 34 ASHRAE 52.2 ASHRAE 55 ASHRAE 62.1 ASHRAE 64 ASHRAE 90.1 - IP ASHRAE 90.1 - SI (2016) ANSI/ASHRAE Standard 15-Safety Standard for Refrigeration Systems and ANSI/ASHRAE Standard 34-Designation and Safety Classification of Refrigerants (2012) Method of Testing for Rating Computer and Data Processing Room Unitary Air-Conditioners (2013) ASHRAE Standard 34-2016 Safety Standard for Refrigeration Systems/ASHRAE Standard 34-2016 Designation and Safety Classification of Refrigerants-ASHRAE Standard 34-2016 (2012) Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size (2010) Thermal Environmental Conditions for Human Occupancy (2010) Ventilation for Acceptable Indoor Air Quality (2011) Methods of Testing Remote Mechanical-Draft Evaporative Refrigerant Condensers (2013) Energy Standard for Buildings Except Low-Rise Residential Buildings (2013) Energy Standard for Buildings Except Low-Rise Residential Buildings AMERICAN WELDING SOCIETY (AWS) AWS Z49.1 (2012) Safety in Welding and Cutting and Allied Processes ASME INTERNATIONAL (ASME) ASME BPVC SEC IX ASME BPVC SEC VIII D1 (2010) BPVC Section IX-Welding and Brazing Qualifications (2015) BPVC Section VIII-Rules for Construction of Pressure Vessels Division 1 ASSOCIATION OF HOME APPLIANCE MANUFACTURERS (AHAM) AHAM RAC-1 (1982; R2008) Directory of Certified Room Air Conditioners ASTM INTERNATIONAL (ASTM) ASTM A123/A123M (2017) Standard Specification for Zinc SECTION 23 81 00 Page 9
(Hot-Dip Galvanized) Coatings on Iron and Steel Products ASTM A153/A153M ASTM A307 ASTM B117 ASTM C1071 ASTM D4587 ASTM D520 ASTM E2129 ASTM E84 ASTM F104 (2016) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware (2014; E 2017) Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength (2016) Standard Practice for Operating Salt Spray (Fog) Apparatus (2016) Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material) (2011) Standard Practice for Fluorescent UV-Condensation Exposures of Paint and Related Coatings (2000; R 2011) Zinc Dust Pigment (2010) Standard Practice for Data Collection for Sustainability Assessment of Building Products (2018) Standard Test Method for Surface Burning Characteristics of Building Materials (2011) Standard Classification System for Nonmetallic Gasket Materials NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) NEMA ICS 6 NEMA MG 1 NEMA MG 2 (1993; R 2016) Industrial Control and Systems: Enclosures (2016; SUPP 2016) Motors and Generators (2014) Safety Standard for Construction and Guide for Selection, Installation and Use of Electric Motors and Generators NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) NFPA 54 (2018) National Fuel Gas Code NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2; TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6; TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10; TIA 17-11; TIA 17-12; TIA 17-13; TIA 17-14) National Electrical Code NFPA 90A (2018) Standard for the Installation of Air Conditioning and Ventilating Systems SECTION 23 81 00 Page 10
U.S. DEPARTMENT OF DEFENSE (DOD) MIL-DTL-5541 UFC 4-010-06 (2006; Rev F) Chemical Conversion Coatings on Aluminum and Aluminum Alloys (2016; with Change 1) Cybersecurity of Facility-Related Control Systems UNDERWRITERS LABORATORIES (UL) UL 1994 UL 1995 (2015) UL Standard for Safety Luminous Egress Path Marking Systems (2015) UL Standard for Safety Heating and Cooling Equipment UL 207 (2009; Reprint Jun 2014) Refrigerant-Containing Components and Accessories, Nonelectrical UL 484 UL 586 UL 900 (2014; Reprint Jul 2015) Standard for Room Air Conditioners (2009; Reprint Dec 2017) Standard for High-Efficiency Particulate, Air Filter Units (2015) Standard for Air Filter Units 1.3 SUBMITTALS NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the submittals required for the project. The Guide Specification technical editors have designated those items that require Government approval, due to their complexity or criticality, with a "G." Generally, other submittal items can be reviewed by the Contractor's Quality Control System. Only add a G to an item, if the submittal is sufficiently important or complex in context of the project. For submittals requiring Government approval on Army projects, a code of up to three characters within the submittal tags may be used following the "G" designation to indicate the approving authority. Codes for Army projects using the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO" for District Office (Engineering Division or other organization in the District Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project Office. Codes following the "G" typically are not used for Navy, Air Force, and NASA projects. SECTION 23 81 00 Page 11
Use the "S" classification only in SD-11 Closeout Submittals. The "S" following a submittal item indicates that the submittal is required for the Sustainability enotebook to fulfill federally mandated sustainable requirements in accordance with Section 01 33 29 SUSTAINABILITY REPORTING. Choose the first bracketed item for Navy, Air Force and NASA projects, or choose the second bracketed item for Army projects. Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for [Contractor Quality Control approval.] [information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.] Submittals with an "S" are for inclusion in the Sustainability enotebook, in conformance to Section 01 33 29 SUSTAINABILITY REPORTING. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES: SD-03 Product Data Spare Parts Posted Instructions Coil Corrosion Protection System Performance Tests Training; G[, [ ]] Inventory Environmental Data Supplied Products Manufacturer's Standard Catalog Data Computer Room Humidifier Humidifier SD-06 Test Reports Refrigerant Tests, Charging, and Start-Up; G[, [ ]] System Performance Tests; G[, [ ]] SD-07 Certificates Service Organizations SD-10 Operation and Maintenance Data Operation and Maintenance Manuals; G[, [ ]] SECTION 23 81 00 Page 12
SD-11 Closeout Submittals Ozone Depleting Substances; S[, [ ]] 1.4 QUALITY ASSURANCE Carefully investigate the plumbing, fire protection, electrical, structural and finish conditions that would affect the work to be performed and arrange such work accordingly, furnishing required offsets, fittings, and accessories to meet such conditions. Submit drawings consisting of: a. Equipment layouts which identify assembly and installation details. b. Plans and elevations which identify clearances required for maintenance and operation. c. Wiring diagrams which identify each component individually and interconnected or interlocked relationships between components. d. Foundation drawings, bolt-setting information, and foundation bolts prior to concrete foundation construction for equipment indicated or required to have concrete foundations. e. Details, if piping and equipment are to be supported other than as indicated, which include loadings and type of frames, brackets, stanchions, or other supports. f. Automatic temperature control diagrams and control sequences. g. Installation details which includes the amount of factory set superheat and corresponding refrigerant pressure/temperature. h. Equipment schedules 1.5 DELIVERY, STORAGE, AND HANDLING Protect stored items from the weather, humidity and temperature variations, dirt and dust, or other contaminants. Properly protect and care for all material both before and during installation. Submit an inventory of all the stored items. Replace any materials found to be damaged, at no additional cost to the Government. During installation, cap piping and similar openings capped to keep out dirt and other foreign matter. 1.6 ENVIRONMENTAL REQUIREMENTS For proper Indoor Environmental Quality, maintain pressure within the building as indicated. Ventilation must meet or exceed ASHRAE 62.1 and all published addenda. Meet or exceed filter media efficiency as tested in accordance with ASHRAE 52.2. Thermal comfort must meet or exceed [ASHRAE 55 ] [AFGM 2016-01]. 1.7 WARRANTY Provide equipment with the [Manufacturer's Standard Warranty.] [[1 year] [2 year] [5 year] [10 year] [ year] manufacturer's warranty.] PART 2 PRODUCTS SECTION 23 81 00 Page 13
NOTE: Inapplicable equipment and system requirements will be deleted or modified in all paragraphs to suit the system designed. Coordinate the standard and design option features typical for each air conditioning/heat Pump unit and individual installation. Care must be taken to avoid specifying design options which are generally unavailable in certain combinations or are inappropriate for the application. Projects which include vapor-compression type refrigeration systems will comply with the safety standards defined in ASHRAE 15 & 34. Designers will be responsible for thoroughly researching and implementing the ASHRAE 15 & 34 safety requirements. For refrigerant-containing parts (excluding piping) located within an indoor space, a designer can use the following 6-step synopsis as a guide in determining "System Application Requirements" from ASHRAE 15 & 34. Step 1. Identify the safety group classification of the refrigerant anticipated to be used in the new refrigeration equipment. Refrigerants R-22 and R-134a are considered Group A1 refrigerants. Refrigerant R-123 is considered a Group B1 Refrigerant. Step 2. Identify the occupancy classification of the facility which will house the new refrigerant equipment. Occupancies include institutional, public assembly, residential, commercial, large mercantile, industrial, and mixed types. Step 3. Determine the system probability (high or low) of the new refrigeration equipment. Split system applications are typically considered high-probability systems according to ASHRAE 15 & 34. Step 4. Estimate the quantity of refrigerant ( gramspounds) in the largest single refrigerant circuit of the new equipment. The designer will research catalog data from different manufacturers in order to get an approximation. Step 5. Determine the volume (cubic meters cubic feet) of the indoor space which is planned to house the new refrigeration equipment. Step 6. Identify the "System Application Requirements" from the applicable table in ASHRAE 15 & 34 based upon the information identified in the previous steps (e.g., safety group, occupancy, system probability, refrigerant quantity, and indoor space volume). The "System Application Requirements" will dictate applicable refrigerant limitations as well as occupied space or mechanical room requirements. SECTION 23 81 00 Page 14
ASHRAE 15 & 34 refers to a mechanical room as a machinery room, however the terms are synonymous. On mechanical room design, ASHRAE 15 & 34 touches on criteria concerning equipment placement, ventilation design, door and passageway restrictions, refrigerant monitoring, open-flame devices, pressure-relief and purge piping. In addition to mechanical room design, ASHRAE 15 & 34 also touches on criteria concerning refrigerant piping, signs, self-contained breathing apparatus (SCBA), and miscellaneous installation restrictions. (SCBAs cannot be considered MCA funded items and are therefore not included in this specification.) 2.1 ENERGY EFFICIENCY REQUIREMENTS NOTE: Delete this paragraph and references to Energy Star program for all Air Force Projects. NOTE: 10 CFR 436.42 specifies that ENERGY STAR qualified and FEMP designated products may be assumed to be life-cycle cost effective. Equipment having a lower efficiency may be specified if the designer determines the lower efficiency equipment to be more life-cycle cost effective. In making such a determination, the designer should rely on the life-cycle cost analysis method in 10 CFR 436, Subpart A. 42 USC 8259b requires the procurement of energy efficient products in product categories covered by the Energy Star program or the Federal Energy Management Program for designated products. A list of covered product categories is available from the Federal Energy Management Web site at http://energy.gov/eere/femp/covered-product-categories. A list of qualified light commercial products is available at http://www.energystar.gov/productfinder/product/certified-light-commercial-hvac/results Submit Material, Equipment, and Fixtures List of all supplied products within a covered product category, including manufacturer's catalog numbers, specification and drawing reference number, warranty information, fabrication site, and energy performance data. For product categories covered by the Energy Star program, submit documentation that the product is Energy Star-qualified. For product categories covered by the Federal Energy Management Program, submit documentation that the product meets or exceeds FEMP-designated efficiency requirements. 2.1.1 Room Air Conditioners Selected room air conditioners are required to meet performance requirements specified by Energy Star. Information on the requirements can be found at http://www.energystar.gov/ia/partners/product_specs/program_reqs/room_air_conditioner_p SECTION 23 81 00 Page 15
2.1.2 Air-Source Heat Pumps Selected air-source heat pumps are required to meet applicable performance requirements specified by Energy Star. Information on the requirements can be found for residential models (single-phase units of 65,000 BTU/h or less)at http://www.energystar.gov/products/specs/system/files/central_ashp_and_cac_program_requ v4_1.pdf and for light commercial models (three-phase units of less than 240,000 BTU/h) at http://www.energystar.gov/products/specs/system/files/lchvac_prog_req_v2_2_0.pdf. 2.2 MATERIALS Provide Manufacturer's standard catalog data, at least [5 weeks] [ ] prior to the purchase or installation of a particular component, highlighted to show material, size, options, performance charts and curves, etc. in adequate detail to demonstrate compliance with contract requirements. Data includes manufacturer's recommended installation instructions and procedures. If vibration isolation is specified for a unit, include vibration isolator literature containing catalog cuts and certification that the isolation characteristics of the isolators provided meet the manufacturer's recommendations. Submit data for each specified component. Minimum efficiency requirements must be in accordance with ASHRAE 90.1 - SI ASHRAE 90.1 - IP. 2.2.1 Standard Products Provide materials and equipment that are standard products of a manufacturer regularly engaged in the manufacturing of such products, which are of a similar material, design and workmanship. The standard products must have been in satisfactory commercial or industrial use for 2 years prior to [bid opening] [request for proposal]. The 2 year use includes applications of equipment and materials under similar circumstances and of similar size. The 2 years' experience must be satisfactorily completed by a product which has been sold or is offered for sale on the commercial market through advertisements, manufacturer's catalogs, or brochures. Products having less than a 2 year field service record will be acceptable if a certified record of satisfactory field operation, for not less than 6000 hours exclusive of the manufacturer's factory tests, can be shown. Products must be supported by a service organization. Ensure system components are environmentally suitable for the indicated geographic locations. 2.2.2 Product Sustainability Criteria 2.2.2.1 Energy Efficient Equipment NOTE: Design federal buildings to conform to the requirements defined in Executive Order 13423 and Public Law (PL) 109-58 - "Energy Policy Act of 2005 (EPAct05)." In accordance with these policies design buildings to achieve energy consumption levels that are at least 30 percent below the levels established in the 2004 publication of ASHRAE 90.1. In addition, all new energy consuming equipment shall be either an "energy Star Qualified Product" or a "FEMP Designated Product" unless no such products exist. Where Energy Star Qualified SECTION 23 81 00 Page 16
Products or FEMP Designated Products are not applicable, products shall meet or exceed the requirements of ASHRAE 90.1. Present applicable efficiencies either in this paragraph or on the design drawings. Delete this paragraph if equipment efficiencies are shown on the drawings. The following is a list of terms which are commonly used in regard to efficiency ratings. COP - Coefficient of Performance (dimensionless) EER - Energy Efficiency Ratio (Btuh/Watt) HSPF - Heating System Performance Factor (Btuh/Watt) SEER - Seasonal Energy Efficiency Ratio (Btuh/Watt) SCOP - Seasonal Coefficient of Performance (dimensionless) IPLV - Integrated Part Load Value (dimensionless) COP and HSPF values are typically used in regard to heating efficiencies. COP values should also be used to define cooling efficiencies when a job is being specified in SI units (EER = 3.415 x COP). COP and EER values are established based strictly upon a unit's full load capacity and not part load capacities. Equipment selected will have as a minimum the efficiency rating determined in http://www.hnd.usace.army.mil/criteria/fyo8/epact05/unitary_eff.xls. Equipment having a higher efficiency than required by ASHRAE 90.1 - SI ASHRAE 90.1 - IP or CID A-A-50502 may be specified if the designer determines the equipment to be more life-cycle cost effective. Provide equipment meeting the efficiency requirements as stated within this section and provide documentation in conformance with Section 01 33 29 SUSTAINABILITY REPORTING paragraph ENERGY EFFICIENT EQUIPMENT. 2.2.2.2 Electrical Equipment / Motors NOTE: Where motor starters for mechanical equipment are provided in motor-control centers, the references to motor starters will be deleted. Provide electrical equipment, motors, motor efficiencies, and wiring which are in accordance with Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Electrical motor driven equipment specified must be provided complete with motors, motor starters, and controls. Electrical characteristics must be as shown, and unless otherwise indicated, all motors of 746 W 1 horsepower and above with open, dripproof, totally enclosed, or explosion proof fan cooled enclosures, must be the premium efficiency type in accordance with NEMA MG 1. Field wiring must be in accordance with manufacturer's instructions. Each motor must conform to NEMA MG 1 and NEMA MG 2 and be of sufficient size to drive the equipment at the specified capacity without SECTION 23 81 00 Page 17
exceeding the nameplate rating of the motor. Motors must be continuous duty with the enclosure specified. Motor starters must be provided complete with thermal overload protection and other appurtenances necessary for the motor control indicated. Motors must be furnished with a magnetic across-the-line or reduced voltage type starter as required by the manufacturer. Motor duty requirements must allow for maximum frequency start-stop operation and minimum encountered interval between start and stop. Motors must be sized for the applicable loads. Motor torque must be capable of accelerating the connected load within 20 seconds with 80 percent of the rated voltage maintained at motor terminals during one starting period. Motor bearings must be fitted with grease supply fittings and grease relief to outside of enclosure. Manual or automatic control and protective or signal devices required for the operation specified and any control wiring required for controls and devices specified, but not shown, must be provided. 2.2.2.3 Ozone Depleting Substances Unitary air conditioning equipment must not use CFC-based refrigerants. Refrigerant may be an approved alternative refrigerant in accordance with EPA's Significant New Alternative Policy (SNAP) listing. Provide documentation in conformance with Section 01 33 29 SUSTAINABILITY REPORTING paragraph OZONE DEPLETING SUBSTANCES. 2.2.2.4 Local/Regional Materials NOTE: Using local materials can help minimize transportation impacts, including fossil fuel consumption, air pollution, and labor. Use materials or products extracted, harvested, or recovered, as well as manufactured, within a [800][ ] kilometer [500][ ] mileradius from the project site, if available from a minimum of three sources. 2.2.2.5 Environmental Data NOTE: ASTM E2129 provides for detailed documentation of the sustainability aspects of products used in the project. This level of detail may be useful to the Contractor, Government, building occupants, or the public in assessing the sustainability of these products. Submit Table 1 of ASTM E2129 for the following products: [ ]. 2.2.3 Nameplates NOTE: In a salt water environment substitute acceptable non-corroding metal, such as but not limited to nickel-copper, 304 stainless steel, or monel. Aluminum is unacceptable. Nomenclature (or system identification) should be established by the designer. SECTION 23 81 00 Page 18
Major equipment including compressors, condensers, receivers, heat exchanges, fans, and motors must have the manufacturer's name, address, type or style, model or serial number, and catalog number on a plate secured to the item of equipment. Plates must be durable and legible throughout equipment life and made of [anodized aluminum] [stainless steel] [ ]. Fix plates in prominent locations with nonferrous screws or bolts. 2.2.4 Safety Devices Exposed moving parts, parts that produce high operating temperature, parts which may be electrically energized, and parts that may be a hazard to operating personnel must be insulated, fully enclosed, guarded, or fitted with other types of safety devices. Safety devices must be installed so that proper operation of equipment is not impaired. Welding and cutting safety requirements must be in accordance with AWS Z49.1. 2.3 EQUIPMENT NOTE: Equipment having a higher efficiency than required by ASHRAE 90.1 or CID A-A-50502 shall be specified if shown to be life-cycle cost effective. Minimum efficiencies shall be according to Energy Star ( http://www.energystar.gov/index.cfm?fuseaction=find_a_product. ) and FEMP (https://www1.eere.energy.gov/informationcenter/) recommendations. 2.3.1 Packaged Terminal [Air Conditioners] [Heat Pumps] NOTE: Refer to ASHRAE 90.1 Table 6.8.1D for the minimum efficiency requirements of electrically operated packaged terminal air conditioners and heat pumps. Air conditioners with a SEER of 14.0 are readily available. 2.3.1.1 Packaged Terminal Unit Provide a [vertical] [through-the-wall], [grade/floor mounted][wall mounted],[wall hung] heavy-duty commercial grade, factory assembled and precharged [air conditioner] [heat pump] unit in accordance with [AHRI 390] [ANSI/AHRI/CSA 310/380] and UL 1995. Provide units listed in AHRI DCAACP.[ Provide Units removable from inside the building for servicing without removing the outside cabinet.] Provide unit with a noise rating in accordance with AHRI 350 that does not exceed [85][ ] db while the entire unit is operating at any fan or compressor speed.[ Heat pump units must contain a reversing valve to change unit to heating cycle.] Provide an outdoor coil temperature sensor to guard against coil freeze-up by either switching to supplemental heat only, or by cycling the compressor to defrost the coil. Provide [Air Conditioners][Heat pumps] with [a minimum [seasonal] energy efficiency ratio ([S]EER) of [ ],] [a minimum Heating Seasonal Performance Factor (HSPF) of [ ],] [a minimum Integrated Part Load Value (IPLV) of [ ],] and [a minimum COP of [ ].] [Provide units suitable for use with minimal ductwork having a total external static SECTION 23 81 00 Page 19
resistance up to 25 Pa 0.1 inch of water.] 2.3.1.2 Compressor Provide a hermetically sealed [reciprocating] [rotary] [variable speed] [digital scroll] [scroll] type Compressor. Provide compressor with permanent split capacitor motor, overload protection, and vibration isolators. Protect compressor against high discharge pressure, loss of charge, low voltage, and short cycling. 2.3.1.3 Air to Refrigerant Coils NOTE: Delete the copper or aluminum tubes and the coating requirement except in corrosive environments. Provide evaporator and condenser coils with [nonferrous] [copper or aluminum] tubes of 10 mm 3/8 inch minimum diameter with [copper][ or ][aluminum] fins that are mechanically bonded or soldered to the tubes. [Protect coil in accordance with paragraph COIL CORROSION PROTECTION.] Provide casing of galvanized steel or aluminum. Avoid contact of dissimilar metals. Test coils in accordance with ASHRAE 15 & 34 at the factory and ensure they are suitable for the working pressure of the installed system. Dehydrate and seal each coil after testing and prior to evaluation and charging. Provide each unit with a [factory operating charge of refrigerant and oil][ or ][holding charge].[ Unit shipped with a holding charge must be field charged with refrigerant and oil.] Provide a condensate removal system. 2.3.1.4 Fans Provide direct driven, statically and dynamically balanced, [centrifugal][or][propeller] type fans. Design the outdoor fan so that condensate will evaporate without drip, splash, or spray on building exterior. Provide indoor fan with a minimum two-speed motor with built-in overload protection. Fan motors must be the inherently protected, permanent split-capacitor type. 2.3.1.5 Air Filters Provide standard filter on all packaged terminal units;[ 25 mm 1 inch] [ 50 mm 2 inch] [ ] mm inch MERV [7] [8] [13] [ ], throwaway filter capable of filtering the entire air supply. 2.3.1.6 Primary/Supplemental Heat Provide heating unit with internal thermal insulation having a fire hazard rating not to exceed 25 for flame spread and 50 for smoke developed as determined by ASTM E84. NOTE: Choose the applicable from the following subparts. [2.3.1.6.1 Electric Heating Provide electric duct heater in accordance with UL 1995 and NFPA 70. Coil SECTION 23 81 00 Page 20
must be completely assembled, unit-mounted, and integral to the unit. Provide coil with nickel chromium elements and a maximum density of 258 Watts per square centimeter 40 watts per square inch. Provide coil with automatic reset high limit control operating through heater backup contactors. Provide coil casing and support brackets of [galvanized steel] [or] [aluminum]. Mount coil to eliminate noise from expansion and contraction and be completely accessible for service. Electric resistance heating elements with high temperature-limit safety device, factory-mounted, and wired to chassis. ][2.3.1.6.2 Gas-Fired Heating Section NOTE: Gas-fired heatng sections are not available for air conditioning units for electronic data processing (EDP) spaces. Provide completely assembled, wired and piped gas fired heating systems within the unit suitable for [natural gas][liquid propane gas] fuel supply. Burner must have [direct spark] [pilot ignition]. fire test all units prior to shipment. Valve must include a pressure regulator. Safety controls must include a flame sensor and air pressure switch. Provide heater section with a forced combustion blower to insure flame stability under varying wind conditions. Gas equipment must bear the AGA label for the type of service involved. Provide burner in accordance with NFPA 54. ][2.3.1.6.3 Hot Water Coils Serpentine type constructed of seamless copper tubes with aluminum fins mechanically or hydraulically bonded to tubes. Provide factory-furnished tee and manual air vent on return connection. Factory test coils at twice maximum operating pressure. ][2.3.1.6.4 Steam Coils Serpentine type constructed of red brass or seamless copper tubes with aluminum fins mechanically or hydraulically bonded to tubes. Factory test coils at twice the maximum operating pressure. ]2.3.1.7 Cabinet Construction Provide cabinet free of visible fasteners, sharp protuberances and edges. Enclosure sheet metal must be a minimum of 1.2 mm 18 gauge steel with a protective coating. Provide removable face panels and allow full access to unit appurtenances. Access to controls must be without removal of the face panel. Discharge conditioned air through adjustable louvers. Thermally and acoustically insulate the cabinet with materials which conform to NFPA 90A. Furnish units with a [field-wired] [prewired] subbase that has leveling screws [with] [without] provisions for remote unit control. Subbase must be of 1.3 mm 18 gauge galvanized steel construction with a protective coating to match that of the room cabinet. Paint and finishes must comply with the requirements specified in paragraph EQUIPMENT AND COMPONENTS FACTORY COATING. 2.3.1.8 Louver Provide storm proof type Louver, constructed of [anodized,] [stamped] [or] [extruded] aluminum. SECTION 23 81 00 Page 21
2.3.1.9 Ventilation Damper Assembly NOTE: Delete requirement for ventilation damper when outside air is supplied to the spaced by a central system. Operated by automatic actuator. Dampers must close on unit shutdown or loss of power and open on heating or cooling start-up. Dampers must have a maximum leakage rate of 8 (L/Min)/m2 at 249 Pa 3 CFM/ft2 at 1 inch w.g. static pressure. 2.3.1.10 Wall Sleeve Provide water and airtight [completely insulated] [non-insulated] assembly, with weather-resistant protective coating. 2.3.1.11 Duct Package Duct extension must consist of 1.3 mm 18 gauge minimum galvanized steel plenum extender with all necessary internal dampers and baffles to divert [25] [ ] percent of the supply air as indicated. Duct extension must be painted with a protective coating that matches room cabinet. 2.3.1.12 Unit Controls Controls must include an on-off switch, high and low selector switch for [the cooling mode] [both the heating and cooling mode], multiple speed fan [cooling] [cooling and heating] mode, room air fan switch, outside air damper control, and an adjustable cooling [only] [and heating] thermostat. Function and temperature controls must be [integral to unit] [remotely mounted as indicated or as accepted by the Contracting Officer]. Controls must include a control system interface to a BACnet Control system. The control system interface must meet DDC Hardware requirements of Section 23 09 23.02 BACNET DIRECT DIGITAL CONTROL FOR HVAC AND OTHER BUILDING CONTROL SYSTEMS. Controls must include a control system interface to a LonWorks control system. The control system interface must meet DDC Hardware requirements of Section 23 09 23.01 LONWORKS DIRECT DIGITAL CONTROL FOR HVAC AND OTHER BUILDING CONTROL SYSTEMS. Controls must include a control system interface to a BACnet or LonWorks control system, whichever is used by the control system in the building in which the unit is installed. For BACnet, the control system interface must meet DDC Hardware requirements of Section 23 09 23.02 BACNET DIRECT DIGITAL CONTROL FOR HVAC AND OTHER BUILDING CONTROL SYSTEMS. For LonWorks, the control system interface must meet DDC Hardware requirements of Section 23 09 23.01 LONWORKS DIRECT DIGITAL CONTROL FOR HVAC AND OTHER BUILDING CONTROL SYSTEMS. 2.3.2 Room [Air Conditioner] [Heat Pump] NOTE: Indicate unit capacity, voltage, phase, installation requirements, etc. on the drawings. At SECTION 23 81 00 Page 22
a minimum, The unit will be required to have an Engery Star Label and efficiency for the unit will be in accordance with ASHRAE 189.1. Provide a [window] [through-the-wall] mounted, appliance grade, factory assembled [air conditioner] [heat pump] unit in accordance with AHAM RAC-1 and UL 484. Units must include a self-contained, precharged, slide-in and removable chassis-mounted, air-cooled refrigeration system. Provide units removable from inside the building for servicing without removing the outside cabinet. Mount compressors on vibration isolators. Minimum cooling capacity must be not less than that indicated. Provide units listed in the AHAM RAC-1.[ Provide light tight units serving dark rooms.] Cooling section must be equipped with a filter-drier on the suction line. Fan and condenser motors must have [open] [drip proof] [totally enclosed] [explosion proof] enclosures.[ Room Air Conditioners must have [a minimum [seasonal] energy efficiency ratio ([S]EER) of [ ],] [a minimum Heating Seasonal Performance Factor (HSPF) of [ ],] [a minimum Integrated Part Load Value (IPLV) of [ ],] and [a minimum COP of [ ].]] [Room Heat Pumps must have [a minimum [seasonal] energy efficiency ratio ([S]EER) of [ ],] [a minimum Heating Seasonal Performance Factor (HSPF) of [ ],] [a minimum Integrated Part Load Value (IPLV) of [ ],] and [a minimum COP of [ ].]] 2.3.2.1 Primary/Supplemental Heat Provide heating unit with internal thermal insulation having a fire hazard rating not to exceed 25 for flame spread and 50 for smoke developed as determined by ASTM E84. NOTE: Choose the applicable from the following subparts. [2.3.2.1.1 Electric Heating Provide electric duct heater in accordance with UL 1995 and NFPA 70. Coil must be completely assembled, unit-mounted, and integral to the unit. Provide coil with nickel chromium elements and a maximum density of 258 Watts per square centimeter 40 watts per square inch. provide coil with automatic reset high limit control operating through heater backup contactors. Provide coil casing and support brackets of [galvanized steel] [or] [aluminum]. Mount coil to eliminate noise from expansion and contraction and be completely accessible for service. Electric resistance heating elements with high temperature-limit safety device, factory-mounted, and wired to chassis. ][2.3.2.1.2 Gas-Fired Heating Section NOTE: Gas-fired heatng sections are not available for air conditioning units for electronic data processing (EDP) spaces. Provide completely assembled, wired and piped gas fired heating systems within the unit suitable for [natural gas][liquid propane gas] fuel supply. Burner must have [direct spark] [pilot ignition]. fire test all SECTION 23 81 00 Page 23
units prior to shipment. Valve must include a pressure regulator. Safety controls must include a flame sensor and air pressure switch. Provide heater section with a forced combustion blower to insure flame stability under varying wind conditions. Gas equipment must bear the AGA label for the type of service involved. Provide burner in accordance with NFPA 54. ][2.3.2.1.3 Hot Water Coils Serpentine type constructed of seamless copper tubes with aluminum fins mechanically or hydraulically bonded to tubes. Provide factory-furnished tee and manual air vent on return connection. Factory test coils at twice maximum operating pressure. ][2.3.2.1.4 Steam Coils Serpentine type constructed of red brass or seamless copper tubes with aluminum fins mechanically or hydraulically bonded to tubes. Factory test coils at twice the maximum operating pressure. ]2.3.2.2 Filters [Provide replaceable media filters of the [dry-media] [washable] type, of the size required to suit the application. Average efficiency must be not less than [25][ ] percent when tested in accordance with ASHRAE 52.2.] [Provide air filters of the [throw-away] [or] [permanent washable] type removable without the use of tools and arranged to filter both room and ventilating air. Filters must have a minimum efficiency reporting value (MERV) of [6][8][ ] when tested in accordance with ASHRAE 52.2.] 2.3.2.3 Fans Provide direct driven, statically and dynamically, [centrifugal][ or ][propeller] type fans. Design outdoor fan so that condensate evaporates without drip, splash, or spray on building exterior. Remove condensate by means of a drain or by evaporation and diffusion. 2.3.2.4 Casing Provide exterior casings for the specified room HVAC Units constructed of factory phosphatized and painted galvanized steel or aluminum sheet metal and galvanized or aluminum structural members. Fit casing with lifting provisions, access panels or doors, fan vibration isolators, electrical control panel, corrosion-resistant components, structural support members, insulated condensate drip pan and drain, and internal insulation in the cold section of the casing. Incorporate provisions to permit replacement of major unit components. Seal penetrations of cabinet surfaces, including the floor. Unit base must be watertight. Fit unit with a drain pan which extends under all areas where water may accumulate. Fabricate drain pan from Type 30X stainless steel, galvanized steel with protective coating as required, or an approved plastic material. Pan insulation must be water impervious. Extent and effectiveness of the insulation of unit air containment surfaces must prevent, within limits of the specified insulation, heat transfer between the unit exterior and ambient air, heat transfer between the two conditioned air streams, and condensation on surfaces. Insulation must conform to ASTM C1071. Construct outside cabinets, including metal grilles to protect condenser coils, of zinc-coated steel or aluminum. Steel and zinc-coated surfaces must receive at least one coat of primer and manufacturer's standard SECTION 23 81 00 Page 24